first lousy attempt to make load indicator in feedView

ui/models/messagefeed.cpp

@@ -346,6 +346,7 @@ void Models::MessageFeed::fetchMore(const QModelIndex& parent)
 {
     if (syncState == incomplete) {
         syncState = syncing;
+        emit syncStateChange(syncState);
         emit requestStateChange(true);
         
         if (storage.size() == 0) {
@@ -373,6 +374,7 @@ void Models::MessageFeed::responseArchive(const std::list<Shared::Message> list,
         } else {
             syncState = incomplete;
         }
+        emit syncStateChange(syncState);
         emit requestStateChange(false);
     }
 }
@@ -543,3 +545,8 @@ void Models::MessageFeed::reportLocalPathInvalid(const QString& messageId)
     
     emit dataChanged(index, index, {MessageRoles::Attach});
 }
+
+Models::MessageFeed::SyncState Models::MessageFeed::getSyncState() const
+{
+    return syncState;
+}

ui/models/messagefeed.h

@@ -41,7 +41,13 @@ namespace Models {
 class MessageFeed : public QAbstractListModel
 {
     Q_OBJECT
-public:
+public:    
+    enum SyncState {
+        incomplete,
+        syncing,
+        complete
+    };
+    
     MessageFeed(const Element* rosterItem, QObject *parent = nullptr);
     ~MessageFeed();
     
@@ -69,6 +75,7 @@ public:
     
     void incrementObservers();
     void decrementObservers();
+    SyncState getSyncState() const;
     
 signals:
     void requestArchive(const QString& before);
@@ -78,6 +85,7 @@ signals:
     void newMessage(const Shared::Message& msg);
     void unnoticedMessage(const Shared::Message& msg);
     void localPathInvalid(const QString& path);
+    void syncStateChange(SyncState state);
     
 public:
     enum MessageRoles {
@@ -102,12 +110,6 @@ protected:
     std::set<MessageRoles> detectChanges(const Shared::Message& msg, const QMap<QString, QVariant>& data) const;
     
 private:
-    enum SyncState {
-        incomplete,
-        syncing,
-        complete
-    };
-    
     //tags
     struct id {};
     struct time {};

ui/utils/feedview.cpp

@@ -28,6 +28,7 @@
 
 constexpr int maxMessageHeight = 10000;
 constexpr int approximateSingleMessageHeight = 20;
+constexpr int progressSize = 70;
 
 const std::set<int> FeedView::geometryChangingRoles = {
     Models::MessageFeed::Attach,
@@ -43,13 +44,18 @@ FeedView::FeedView(QWidget* parent):
     vo(0),
     specialDelegate(false),
     specialModel(false),
-    clearWidgetsMode(false)
+    clearWidgetsMode(false),
+    modelState(Models::MessageFeed::complete),
+    progress()
 {
     horizontalScrollBar()->setRange(0, 0);
     verticalScrollBar()->setSingleStep(approximateSingleMessageHeight);
     setMouseTracking(true);
     setSelectionBehavior(SelectItems);
 //     viewport()->setAttribute(Qt::WA_Hover, true);
+    
+    progress.setParent(viewport());
+    progress.resize(progressSize, progressSize);
 }
 
 FeedView::~FeedView()
@@ -293,6 +299,13 @@ void FeedView::mouseMoveEvent(QMouseEvent* event)
     QAbstractItemView::mouseMoveEvent(event);
 }
 
+void FeedView::resizeEvent(QResizeEvent* event)
+{
+    progress.move((width() - progressSize) / 2, 0);
+    
+    QAbstractItemView::resizeEvent(event);
+}
+
 
 QFont FeedView::getFont() const
 {
@@ -319,14 +332,22 @@ void FeedView::setItemDelegate(QAbstractItemDelegate* delegate)
     }
 }
 
-void FeedView::setModel(QAbstractItemModel* model)
+void FeedView::setModel(QAbstractItemModel* p_model)
 {
-    QAbstractItemView::setModel(model);
+    if (specialModel) {
+        Models::MessageFeed* feed = static_cast<Models::MessageFeed*>(model());
+        disconnect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
+    }
     
-    Models::MessageFeed* feed = dynamic_cast<Models::MessageFeed*>(model);
+    QAbstractItemView::setModel(p_model);
+    
+    Models::MessageFeed* feed = dynamic_cast<Models::MessageFeed*>(p_model);
     if (feed) {
+        onModelSyncStateChange(feed->getSyncState());
         specialModel = true;
+        connect(feed, &Models::MessageFeed::syncStateChange, this, &FeedView::onModelSyncStateChange);
     } else {
+        onModelSyncStateChange(Models::MessageFeed::complete);
         specialModel = false;
     }
 }
@@ -352,3 +373,17 @@ void FeedView::onMessageInvalidPath(const QString& messageId)
     }
 }
 
+void FeedView::onModelSyncStateChange(Models::MessageFeed::SyncState state)
+{
+    if (modelState != state) {
+        modelState = state;
+        
+        if (state == Models::MessageFeed::syncing) {
+            progress.show();
+            progress.start();
+        } else {
+            progress.stop();
+            progress.hide();
+        }
+    }
+}

ui/utils/feedview.h

@@ -25,6 +25,7 @@
 #include <set>
 
 #include <ui/models/messagefeed.h>
+#include "progress.h"
 
 /**
  * @todo write docs
@@ -56,6 +57,7 @@ protected slots:
     void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> & roles) override;
     void onMessageButtonPushed(const QString& messageId, bool download);
     void onMessageInvalidPath(const QString& messageId);
+    void onModelSyncStateChange(Models::MessageFeed::SyncState state);
     
 protected:
     int verticalOffset() const override;
@@ -63,6 +65,7 @@ protected:
     void paintEvent(QPaintEvent * event) override;
     void updateGeometries() override;
     void mouseMoveEvent(QMouseEvent * event) override;
+    void resizeEvent(QResizeEvent * event) override;
     
 private:
     bool tryToCalculateGeometriesWithNoScrollbars(const QStyleOptionViewItem& option, const QAbstractItemModel* model, uint32_t totalHeight);
@@ -78,6 +81,8 @@ private:
     bool specialDelegate;
     bool specialModel;
     bool clearWidgetsMode;
+    Models::MessageFeed::SyncState modelState;
+    Progress progress;
     
     static const std::set<int> geometryChangingRoles;